Synthesis of hepatic secretory proteins in normal adults consuming a diet marginally adequate in protein


Jackson, Alan A., Phillips, Gary, McClelland, Irene and Jahoor, Farook (2001) Synthesis of hepatic secretory proteins in normal adults consuming a diet marginally adequate in protein. American Journal of Physiology: Gastrointestinal and Liver Physiology, 281, (5), G1179-G1187.

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Description/Abstract

The plasma concentration and hepatic synthesis rates of albumin, transthyretin, very low-density lipoprotein apolipoprotein B-100 (VLDL-apoB-100), high-density lipoprotein apolipoprotein A-1, fibrinogen, α1-antitrypsin, and haptoglobin were measured in six normal adults before and after consuming a protein intake of 0.6 g · kg body wt-1 · day-1 for 7 days. The synthesis of hepatic proteins was measured from the incorporation of [2H5]- phenylalanine, following prime/continuous infusion, using plasma VLDL-apoB-100 isotopic enrichment to represent the precursor pool. Synthesis of albumin declined by 50% (P < 0.001) following the lower-protein diet, VLDL-apoB-100 declined by 20% (P < 0.001), and apoA-1 declined by 16% (P < 0.05). By contrast, synthesis increased for fibrinogen (50%, P < 0.05) and haptoglobin (90%, P < 0.001). This pattern of change, with decreased synthesis of nutrient transport proteins and increased formation of acute-phase proteins, suggestive of a low-grade inflammatory response, was accompanied by increased plasma concentration of the inflammatory cytokine interleukin 6 (30%, P < 0.05). The pattern of change in the synthesis of hepatic secretory proteins following 7 days on the low-protein diet may be of functional relevance for lipid transport and the capacity to cope with stress.

Item Type: Article
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Keywords: protein synthesis, phenylalanine, albumin, transthyretin, very low-density lipoprotein apolipoprotein B-100, high-density lipoprotein apolipoprotein A-1, fibrinogen, alpha 1-antitrypsin, haptoglobin
Subjects: R Medicine > R Medicine (General)
Q Science > QP Physiology
Divisions: University Structure - Pre August 2011 > School of Medicine > Developmental Origins of Health and Disease
ePrint ID: 25654
Date Deposited: 11 Apr 2006
Last Modified: 27 Mar 2014 18:14
URI: http://eprints.soton.ac.uk/id/eprint/25654

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